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Bar)
According to the needs of the project construction, the temporary facilities of the project include on-site temporary offices, workers' dormitories, dining halls, toilets, bathrooms, material warehouses and other temporary facilities, which are arranged in the construction site according to the situation of the site. The temporary buildings adopt single-storey movable slab houses.
The electric power supply and wire laying should avoid the safe channel opening with large personnel flow, and the range that is easy to be hit by falling objects. The wire should be concealed as far as possible.
The arrangement of small and medium-sized machinery should be in a safe environment and avoid the range of high altitude objects.
Temporary construction materials should be stacked as far as possible within the scope of vertical transport machinery coverage, to avoid secondary handling.
(2) The layout should give full consideration to the construction machinery and equipment, office, life, roads, on-site entrances and exits, temporary stacking sites, etc. for optimization and reasonable layout.。
According to the characteristics of the project, the site layout should fully consider various environmental factors and construction needs, the layout of the construction site should follow the following principles:
Site equipment (welding machine, water pump, gate box, etc.) should be waterproof measures.
Before entering the rain application, the project department shall carry out a comprehensive inspection of tower cranes and construction elevators used in the construction of the project. After each major storm, the project department shall recheck and deal with problems in time.
During the rain application period, the deformation of the foundation pit wall that has not been backfilled must be monitored, and the settlement observation of the surrounding buildings and roads should be done well, and the problems should be found and dealt with in time.
Drainage ditch and catchment pit are set in the foundation pit, dam is set at the foundation pit side, and continuous and compact construction is organized, and the foundation pit is backfilled in time.
Ensure the construction site transport road smooth and skid.
Before rain application, the project department shall prepare a targeted construction plan during rain period that can guarantee the project quality and construction safety.
Before the rain operation, the project department shall set up a flood control and flood control rescue team with the project manager as the leader of no less than 30 people, who shall be responsible for flood control and rescue work during the rain period.
(3) In order to reduce freezing damage, the water consumption of the proportion should be reduced to the minimum. The method is to control the collapse degree, add water reducing agent, give priority to the use of high efficiency water reducing agent.
Winter construction of concrete, in order to shorten the curing time, generally should choose Portland cement and ordinary Portland cement. Cement label should not be less than 425, cement content per cubic meter of concrete should not be less than 300kg, water cement ratio should not be greater than 0.6. And add early strength agent.
Concrete with slag Portland cement shall be 40% of the designed concrete strength standard, but not less than 5.0N/mm2 for concrete with C10 or less.
Portland cement or ordinary Portland cement concrete, 30% of the design of concrete strength standard value.
Before the temperature of concrete drops to 0℃, its compressive strength shall not be lower than the critical strength of frost resistance.
In winter, reinforcing bar welding under negative temperature condition should be carried out indoors as far as possible. If welding must be done outdoors, the ambient temperature should not be less than -20℃, and the wind force should be more than level 3. The uncooled steel joints after welding are strictly prohibited from touching snow and ice.
The cold drawing temperature of steel bar should not be lower than -20℃. The tension temperature of prestressed steel bar should not be less than -15℃.
In the ground beam on the frost heaving soil, where the permafrost may be uplifted below, it is necessary to cushion with loose materials such as slag and slag.
When tamping manually, the thickness of each layer shall not exceed 20cm, and the thickness of tamping shall be 10~15cm
Before backfilling, clean the ice, snow and insulation materials on the base before backfilling
In winter digging, the permafrost is piled together to be covered to prevent freezing and reserved for backfilling
When backfilling soil in winter, the following measures should be taken
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